I actually think your grandfather is being quite reasonable - unlike FA/pilot industrial actions, the effects of a mechanics strike take longer to develop and last for a much longer period. Sure, NWA is running OK now, but wait until the required A/B/C/D checks pile up along with AOGs in about a week - corners will get cut and the DC-9/DC-10 fleets are particularly vulnerable on account of the more intensive and complex mx required on account of their age.

To be blunt, it will be a small miracle for NWA to avoid sending a DC-9 into a Midwestern cornfield should the strike last for any extended duration.